Flexible printing sheet



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UNITED. STATES PATENT OFFICE.

EDMUND LICHTENSTEIN, OF BERLIN, GERMANY, ASSIGNOR TO THE FIRM: iDEUTSCHEMASCHINENBAU- UND VERTRIEBS- GESELLSCHAFT M. 13. IL, OE BERLIN, GERMANY.

FLEXIBLE PRINTING SHEET.

Application filed November 3, 1925, Serial No. 66,681, and in GermanyNovember 4, 1924.

In constructing small duplicating or printing machines using the knownflatprinting or off-set printing it 1s very desirable to counteract theinherent complication of such process for enabling unskllled persons touse the machines successfully.

In the first place the printing sheet comes in question and it has beenproposed to use for printing a sheet of metallized paper or an extremelythin sheet of metal like zinc or aluminum backed with paper.

Such a metallized paper can be provided with inscriptions for instanceby means ofan ordinary type writing machine and on account of itsflexibility can be arranged ing cylinder of the printing machine withoutusing tools or the like.

The flexible sheet is prepared for this by being cut to accurate measureand by being provided i :ith suitable holes or perforations forreceiving the securing means. Further the active surface of the sheetcan be prepared in any known manner for giving it the suitable structureor grain for the-printing process.

Such known sheets are improved by. the present invention which isillustrated in the accompanying drawing in which the sole figure is aplan view of a sheet prepared according to the invention.

By the fastening means of the machine some parts of the flexible sheetare required for holding the sheet on the cylinder so that such parts ofthe sheet are not available foiprinting. The skilled typist in arrangingthe inscriptions or the like on the sheet would take account of thisfact by determining the available area of the sheet for printing.

However a typist unskilled in the practice of duplicating wouldencounter difficulties. According to the invention these difficultiesare removed by so preparing the sheet that the limits of the spaceavailable for printing can be seen easily.

Accordim to the invention this result is obtained by preparing the sheetin the factorv with lines or the like confining the area of the flexiblesheet available for inscriptlons.

The possibility that these confining lines under sufficient tension onthe correspond-- or thelikewill be transferred to the duplicates printedfrom such a flexible printing sheet is excluded by producing thedistinction between the available printing area and the other parts ofthesheet in any way preventing the printing of such confining meanstogether with the inscriptions. This may be obtained, for instance, byusin different grain for the different parts 0 the sheet produced, forinstance, by sand blasting with sand of, different degrees of finenessor by using a flat-free imprint.

In a similar way lines not to be trans ferred in duplicating can bearranged on the area available for printing before the flexible sheet isgiven to the dealers or users.

However the transfer to the duplicates of such or similar characters orthe like arranged a priori on the flexible'sheets is de sir-able incertain cases and the invention is therefore also concerned therewith.For instance letter heads or any pictures of a more or less complicatedor delicate nature can be arranged a priori on the flexible sheet aswell as lines for musical notes. Thereby it is possible for any musicianunskilled in off-set printing or flat printing to use such flexiblesheets and to inscribe the musical notes in the ordinary way.

For further simplifying the use of the flexible sheets by suitablepreparation also the photoprinting process can be made use i of in sucha way that the area availablefor printing is prepared to becomesensitive for light in' any Well known manner.

Having described the invention I declare that, what I claim is 1. Aflexible grained planograph printingsheet having an area available forprinting and an area not available for printing,

said areas being visibly distinguishable from each other by thecharacter of the grain.

2. A flexible grained planograph printing sheet having an area availablefor printing and an area not available for printing. said areas beingvisibly demarked by nonprinting imperforate boundary lines.

In testimony whereof I affix my signature.

EDMUND LICHTENSTEIN.

